Mini Inductive Sensors Target Embedded Apps On The Squeeze

Embedded applications often require small sensors to fit in tight areas, such as those found in metal-stamping industries. A novel series of 3-mm diameter sensors gives designers another option in this arena. The Bi-1EH03 line of Picoprox miniature inductive sensors from Turck Inc. features a 1-mm sensing range on mild steel without the need for an in-line amplifier. An LED located near the cable entry of the sensor enables users to easily confirm that the appropriate operation is in progress.

The sensors consist of a smooth stainless-steel barrel with two meters of polyurethane potted-in cable for increased durability where cutting coolants and other harsh chemicals reside. Besides the standard 2-mm cable lengths, Turck can mold standard M8 Picofast and M12 Eurofast connectors to the cable in varying lengths besides the standard lengths for easy installation.

The three-wire sensors produce a TTL-compatible, three-wire output of 10 to 30 V dc with an output current of 100 mA, in npn (# M619323) and pnp (# M619322) versions for sinking and sourcing applications, respectively. The sensors switch at 5 kHz and contain integral circuitry that protects against wire breaks and reverse-polarity conditions. Designed for use in industrial environments, they can operate from ­25°C to 70°C (­13°F to 158°F) and carry protection ratings in accordance with IP67 specifications.

List price for the Bi-1EH03 Picoprox sensors is $111. Availability is from stock.